AD7847BN

Overview

The AD7847BN is a complete, dual, 12-bit multiplying digital-to-analog converter (MDAC) manufactured by Analog Devices Inc. It integrates two independent DAC channels with internal output amplifiers on a monolithic CMOS chip. The device features an R-2R segmented architecture and requires no external user trims for specified performance. It utilizes a parallel loading structure where each channel has its own chip select input (CSA/CSB) and shares a common write input (WR). The AD7847BN operates within a temperature range of -40°C to +85°C and is housed in a 24-lead Plastic DIP (N-24) package.

Feature Summary

• Dual 12-bit MDACs with integrated buffered output amplifiers
• Parallel interface with independent Chip Select inputs (CSA, CSB) and common Write (WR)
• High accuracy: ±1/2 LSB relative accuracy and ±1 LSB differential nonlinearity
• Fast settling time of 3 µs typical to within ±1/2 LSB

Applications

• Automatic Test Equipment
• Function Generation and Waveform Reconstruction
• Programmable Power Supplies
• Synchro Applications

Procurement Notes

Verify the specific suffix 'BN' corresponds to the N-24 Plastic DIP package and ±1/2 LSB relative accuracy grade as defined in the Ordering Guide. Confirm that the required operating temperature range aligns with the Industrial specification (-40°C to +85°C). Ensure ESD precautions are observed during handling due to the sensitivity of the LC2MOS process.

Selection Notes

Select the AD7847BN over the AD7837 when a full 12-bit parallel data bus interface is preferred, eliminating the need for multi-byte write cycles. The AD7847 allows simultaneous or independent latching via CSA/CSB. Verify that the power supply requirements of ±14.25 V to ±15.75 V fit the system design. Consider the AD7847AR if a surface-mount SOIC package is required instead of through-hole DIP.

Part Context

The AD7847 is part of the AD7837/AD7847 family of complete dual 12-bit MDACs from Analog Devices. These devices utilize LC2MOS technology to provide high-speed performance with low power consumption. The AD7847 variant specifically distinguishes itself from the AD7837 by offering a direct 12-bit parallel interface, whereas the AD7837 uses an 8-bit bus structure requiring address lines for latch selection.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.